THE CANADIAN ENTOMOLOGIST 249 



NOTES ON COCCID^— IV. (HEMIPTERA).* 



BY G. F. FERRIS. STANFORD UNIVERSITY, CALIFORNIA. 



In an earlier paper of this series I called attention to the artificial character 

 of the genus Sphaerococctis, and began the process of transferring the included 

 species to other genera. At that time specimens of the genotype, 5. casuarina 

 Maskell, were not available for examination, but since then (through the kind- 

 ness of Professor Cockerell) I have been enabled to see specimens of this species. 

 The suspicion that I then expressed to the effect that this species is merely an 

 Antonina is nearly, if not quite, substantiated, for it is certainly of this type. 

 However, there are certain points upon which the genus Sphaerococcus may, 

 for the present, be maintained. 



I am here redefining the genus. Also, I am removing from this genus 

 three more species, one of which, S. ohscuratus Maskell, I refer provisionally 

 to the genus Kuwanina, another, 5. leptospermi Maskell, which I refer to the 

 genus Amorphococcus, and another, 5. pirogallis Maskell, for which I name a 

 4iew genus, Eremococciis. I may note here that Sphaerococcus sylvestris Ckll. 

 and King, is probably nothing more than an immature stage of som.e species of 

 Kermes. 



Genus Sphaerococcus (Maskell). 



Coccidse referable to the subfamily Dactylopiinse (of the Fernald Cata- 

 logue) and belonging to the Pseiidococcus group, that is, possessing dorsal ostioles. 

 Adult female resembling the female of Antonina; apodous; with the antennae 

 reduced to mere vestiges of three or four minute segments; with the posterior 

 end of the abdomen invaginated to form a short tube at the inner end of which 

 is the anal ring, this bearing six short setae. Differing from Antonina (if at 

 all) only in the fact that the legs are present in the penultimate stage of the 

 female. First stage larva with six- segmented antennae, with six hairs on the 

 anal ring, with dorsal ostioles. 



Type of the genus, Sphaerococcus casuarince Maskell. It is probable that 

 none of the other species now referred to this genus are congeneric with the 

 geno-type. 



Notes. — As I have pointed out in the description given above, this is essen- 

 tially an Antonina, differing only in the fact that the legs are retained in the 

 penultimate stage. However, this point needs investigation. I would call 

 attention to the fact that in one species now referred to Antonina {A. parrotti 

 Ckll.) the anterior pair of legs alone are retained in what has been described 

 as the adult. In specimens of A . indica Green, the legs are lacking in the penulti- 

 mate stage. 



Sphaerococcus casuarinae (Maskell). 



Fig. 33. 



There is little except detail to add to the description given by Maskell. 

 The species resembles the various species of Antonina except that it is more 

 nearly circular. The anal ring bears six short setae and is not hairless, as asserted 

 by Maskell. Beyond this the material examined does not permit me to go. 



*Continued from Canadian Entomologist, vol. 50, p. 11.3, (1919). 

 November. 1919 



